Photographic recording element



Aug. 9, 1966 E. J. BODME R ETAL 3,265,503

PHOTQGRAPHIC RECORDING ELEMENT Filed June 27, 1962 GREEN FILTER BLUE FILTER GELATIN OVERCOAT GREENSENSITIVE EMULSION WITH INCORPORATED CYAN-FORMING COUPLER GELATIN INTERLAYER BLUE-SENSITIVE EMULSION WITH INCORPORATED YELLOW-FORMING COUPLER AND MAGENTA 'FORMING COUPLER PAPER SUPPORT JFK-9.21

13 DEVELOPED fl' r CYAN DYE IMAGE l8 '5 DEVELOPED YELLOW DYE AND MAGENTA g DYE IMAGE Edward JBodm'er Gomelius JMurybgJn Robertlmsterrett INVE TORS 411mm & AGENT United States Patent 3,265,503 PHOTOGRAPHIC REQDRDING ELEMENT Edward J. Bodmer, Cornelius J. Murphy, Jr., and Robert M. Sterrett, Rochester, N.Y., assignors to Eastman Kodak Company, Rochester, N.Y., a corporation of New Jersey Filed June 27, 1962, Ser. No. 205,642 8 Claims. (Cl. 96-74) This invention is related to a photographic element for use in recording the time-variations of electrical phenomena in various recording instruments and particularly to a multiple-layer color paper and its use in such instruments.

It is known to use photographic elements of the printout type for recording the high speed fluctuation of electrical current in recording instruments of various types, including oscillographs.

Usually, instruments of this type employ galvanometers provided with mirrors and the movements of the mirrors, which are responsive to fluctuation in an electric circuit, are caused to direct beams of light onto a moving film contained in a camera Where the recording is made. Such a system is described in Heiland US. Patent 2,580,427, issued January 1, 1952. Also, instruments which produce variable area light beams or light beams of variable intensity can be used. Examples of such instruments are the Triple Recording Oscillograph, TRO6, manufactured by SIE, Division of Dresser Electronics, Houston, Texas, which produces multiple displays of the conventional wiggle, variable density and variable area; and the PB50 Field Ofiice Seismic Data Reduction System, manufactured by the Electrodynamic Instrument Corporation, Houston, Texas, which produces a conventional trace or variable density cross sections.

Usually, printout elements used require special high intensity ultraviolet sources such as a Mercury Arc Osram Lamp for making the recording.

The black-and-white recording papers usually used have limited information storage capacity per unit area because superimposed signals become incoherent.

It is, therefore, an object of our invention to provide a novel photographic element which records traces of three distinctly diiferent colors, thus permitting a large degree of overlap without loss of information and providing greatly increased storage capacity per unit area.

Another object is to provide a photographic recording element which does not require high intensity ultraviolet sources for exposure, but which is exposed with an ordinary tungsten light by using appropriate optical filters.

Another object is to provide a photographic recording element which has only two light-sensitive layers which are false sensitized and are capable of producing two colored images that are approximately complementary to one another, for maximum visual discrimination between the dye images and between each dye image and the neutral image that is formed by the combination of the two dye images.

Another object is to provide a process for producing a multichannel recording with our photographic recording element making one record( s) in a colored image, another record(s) in a colored image that is approximately the complement of the first colored image and a third record(s) that is approximately neutral in color.

Still other objects will become evident from the following specification and claims.

These and other objects are accomplished by the photographic recording element of our invention. In its simplest form, our element comprises a support coated with a photographic silver halide emulsion layer sensitized to light in one part of the visible region of the spectrum,

Patented August 9, I966 ice said emulsion containing an incorporated color-forming coupler, and a second photographic silver halide emulsion sensitized to light of another part of visible region of the spectrum which is difi'erent enough in sensitivity from the sensitivity of the first emulsion so that visible exposing light can be filtered to expose one emulsion and not the other and vice versa, said second emulsion containing an incorporated coupler that forms a dye that is complementary to the dye image formed in the first light-sensitive layer or alternatively, a combination of two incorporated color-forming couplers which form dyes upon color development that together absorb light of the color that is approximately the complement of the light absorbed by the dyes formed by the first layer.

Preferably, these two light-sensitive layers are separated by a hydrophilic colloid layer such as gelatin or a gelatin substitute. It is advantageous to incorporate a non-difiusing reducing agent such as a ballasted hydroquinone derivative in this interlayer.

In one embodiment of our invention, the element comprises a support coated with a photographic silver halide emulsion sensitized to blue light and containing incorporated yellow-forming coupler and magenta-forming coupler, a gelatin interlayer, and a green-sensitized silver halide emulsion containing incorporated cyan color-forming coupler.

In other embodiments of our invention, the element contains a blue-sensitive layer with cyan-forming coupler and a green-sensitive layer with a yellow coupler and a magenta coupler, or a blue-sensitive layer with a cyan coupler and a yellow coupler and a green-sensitive layer with a magenta coupler, or a blue-sensitive layer with a cyan coupler and a magenta coupler and a green-sensitive layer with a yellow coupler, or a blue-sensitive layer with a magenta coupler and a green-sensitive layer incorporating a cyan coupler and a yellow coupler. Alternatively, any of these elements described can have the green sensitive layer coated on the support with the interlayer and then the blue-sensitive layer on top.

In another embodiment of our invention, the element can consist of a transparent support with one of the lightsensitive layers coated on one side and the second lightsensitive layer coated on the other side. In this element, the support also serves as an interlayer.

In another embodiment of our invention, a bleachable filter layer is incorporated in the element between the two light-sensitive layers containing a dye which transmits light in the region of the spectrum to which the lower light-sensitive layer is sensitive. For example, where an interlayer is used the bleachable dye is incorporated in it. Alternatively, the bleachable dye is incorporated on the support when it is between the lightsensitive layers.

In still other embodiments of our invention, the lightsensitive layers can have one or more strata of the type described in Millikan U.S. Serial No. 159,057, filed December 13, 1961. For example, one strata would be a high speed emulsion and the second strata a low speed emulsion both optically sensitized to the same portion of the spectrum and producing the same dye image. Similarly, the second light-sensitive layer can have one or more strata.

Also, our invention includes the use of single couplers in place of the combination of couplers used in one of the light-sensitive layers, for example, a red color-forrning coupler can be used in place of the combination of a yellow-forming coupler and a magenta-forming coupler, a green color-forming coupler can be used in place of the combination of the yellow-forming coupler and cyan forming coupler, etc. The particular combination of light sensitivity of the emulsion and the color-forming coupler is not critical as long as color images produced can be readily discriminated. It is preferable to use couplers which will produce dyes in the two sensitive layers which are approximately complementary to each other.

It is advantageous to have a hydrop-hilic colloid layer such as gelatin or a gelatin substitute coated on the outermost layer to provide physical protection for this layer.

In the silver halide emulsions used in our photognaphic elements, various silver salts can be used as the sensitive salts, including silver bromide, silver iodide, silver chloride, or silver halides such as silver chlorobromide, silver bromoiodide, etc.

The emulsions can be chemically sensitized by any of the accepted procedures. The emulsions can be digested with naturally lactive gelatin, or sulfur compounds can be added such as those described in Sheppard U.S. Patent 1,574,944, issued March 2, 1926; Sheppard et al. U.S. Patent 1,623,499, issued April 5, 1927; and Sheppard et a1. U.S. Patent 2,410,689, isued November 5, 1946.

The emulsions can also be chemically sensitized with reducing agents such as stannous salts (Carroll U.S. Patent 2,487,850, issued November 15, 1949), polyamines, such as diethyl triamine (Lowe and Jones U.S. Patent 2,518,- 698, issued August 15, 1950), polyamines, such as sper mine (Lowe and Allen U.S. Patent 2,521,925, issued September 12, 1950), or bis(B-aminoethyl)sulfide and its water-soluble salts (Lowe and Jones U.S. Patent 2,521,- 926, issued September 12, 1950).

In the preparation of the silver halide dispersions employed for preparing silver halide emulsions, there may be employed as the carrier for the silver halide in its preparation, gelatin or some other colloidal material such as colloidal albumin, a cellulose derivative, or a synthetic resin, for instance, a polyvinyl compound. Some colloids which may be used are polyvinyl alcohol or a hydrolyzed polyvinyl acetate as described in Lowe U.S. Patent 2,286,215, issued June 16, 1942; a far hydrolyzed cellulose ester such as cellulose acetate hydrolyzed to tan acetyl content of 1926% as described in U.S. Patent 2,326,808 of Lowe and Clark, issued August 24, 1943, a water-soluble ethanolamine cellulose acetate as described in Yutzy U.S. Patent 2,322,085, issued June 15, 1943; a polyacryllamine having a combined acrylamide content of 30-60% and a specific viscosity of 025-15 on an imidized polyacrylamide of like :acrylamide content and viscosity as described in Lowe, Minsk and Kenyon U.S. Patent 2,541,474, issued February 13, 1951; zein as described in Lowe U.S. Patent 2,563,791, issued August 7, 1951; a vinyl alcohol polymer containing urethane carboxylic acid groups of the type described in Unruh and Smith U.S. Patent 2,768,154, issued October 23, 1956; or containing cyano-acetyl groups such as the vinyl alcoholvinyl cyanoacetate copolymer as described in Unruh, Smith and Priest U.S. Patent 2,808,331, issued October 1, 1957; or a polymeric material which results from polymerizing a protein or a saturated acylated protein with a monomer having a vinyl group as described in U.S. Patent 2,852,382, of Illingsworth, Dann and Gates, issued September 16, 1958.

Included among the green sensitizers we add merocyanines of Brooker et al. U.S. Patent 2,493,747, issued January 10, 1950, such as 3-(p-carboxyphenyl)-5-(3-methy-1-2(3 -benzoxazo1ylidene -rhodanine, 1- (p-carb oxyphenyl) 4 [(3-ethyl-2(3)-benzothiazolylideneisopropylidene)] 3 methyl-S-pyrazolone, 3-ethyl-5-[(3-et'hyl-2(3)- benzoxazolylidene)ethylidene] 2 [3-methyl-5-oxo-1- (p sulfophenyl) 4-(2-pyrazolinyliden'e)]-4-tlriazolidone, etc., the merocyanines of Brooker et al. U.S. Patent 2,- 493,748, issued January 10, 1950, such as B-oarboxymethyl 5 [(3-methyl-2(3)-thiazolinylidene)-ethylidene]-2- thio 2,4(3,5) oxazoledione, 5-[(3-ethyl-2(3)-benzoxazolylidene) ethylidene] 3-sulfomethyl-2-thio-2,4(3,5)- oxazoledione, etc.; the merocyanines of Sprague U.S. Patent 2,519,001, such as 5-[(3-fl-carboxyethyl-2(3)-benzothiazolylidene) ethylidene]-3-ethyl-l-phenyl-Z-thiohydantoin, etc.; the cyanine dyes of Sprague U.S. Patent 2,503,776, issued April 11, 1950, such as anhydro-S- chloro 1 ethyl-3-fl-sulfoethylthia-2'-cyanine hydroxide, etc., and other sensitizers well known in the art.

Included among the blue sensitizers are acid merocyanines of Brooker et al. U.S. Patent 2,493,747, issued January 10, 1950, such as 4[(5-chloro-3-ethyl-2(3)-benzothiazolylidene) or ethylethylidene]-3-methyl-1-(p-sulfophenyD-S-pynazolone, etc.; the merocyanines of Brooker et al. U.S. Patent 2,493,748, such as 3-carboxymethyl 5 (3-ethy1-2(3)-benzothiazolylidene)rhodanine, etc., and other sensitizers well known in the art.

As was indicated previously, our silver halide emulsions can be sensitized to light of other wavelengths than to green or to blue so long as the exposing light can be filtered so that one emulsion can be preferentially exposed Without exposing the other emulsion. Sensitizing dyes having maximum sensitizing efiects at other wavelengths and which can be used in our elements are found in the sensitizer references given and in other references, such as are described in Brooker U.S. Patents 1,846,301 and 1,846,302, both issued on February 23, 1932; 1,942,- 854, issued January 9, 1934; White U.S. Patent 1,990,507, issued February 12, 1935; Brooker and White U.S. Patent 2,165,338, issued July 11, 1939; and many others.

Typical color-forming compounds or couplers which are useful in our recording elements include the following:

Couplers producing cyan images 5- (p-amylphenoxybenzenesulfonamino) -1-naphthol 5- N-benzyl-N-naphthalenesulfonamino) 1 -riaphthol 5-(n-benzy-N-n-valeryliarnino)-1-naphthol 5 -caproylaminol-nlaphthol 2-chloro-5-(N-n-valeryl-N-p-isopropylbenzylamino) -1- naphthol 2,4-dichloro-5- (p-nitrobenzoyl-fi-o-hydroxyethylamino l-naphthol 2,4-d1Chll0l'O-5 -palmitylaminol-nap hthol 2,2'-dihydroxy-5 ,5 '-dibromostilbene 5-dip henylethersulfonamido- 1 -naphthol 1-hydroxy-2- N-isoamyl-N-phenyl naphtharnide 1-hydroxy-2- (N-p-sec.-amylphenyl naphthamide 8-l1ydroxy-1-a-naphthoyl-1,2,3,4-tetrahydroquinoline 2-lauryl-4-ehlorophenol 1-naphthol-2-carboxylic-ot-naphthalide 1-naphthol-5-sulfo-cyclohexyilamide S-phenoxyacetarninol-naphthol S-fl-phenylpropionylamino- 1 -naphthol Monochlor-S- N-y-phenylpropyl-N-p-sec.-arnylbenzoylamino) -1-naphthol 2- acetyla1nino-5 -methylp henol 2-benzoylamino-3,5 -dimethylphenol 2-a (p-terL- amylphenoxy) n-butyrylamino-S-methylphenol 6-{'y-{4- ['y- 2,4-di-tert.-arnylphenoxy) butyramido] phenoxy}acetamido}-2,4dichloro-3 -methylphenol 1-hydroxy-2-[ 6-(2,4-di-tert.-amylphenoxy-n-butyl]naphthamide 2-OL (p-tert.-amylphenoxy -n-butyrylamino-4-chloro-5- methylphenol 2- (p-tertaamylphenoxy-p-benzoyl) amino-4-chloro-5- methylphenol 2- 4 -tert.-amyl-3 -phenoxybenzoylamino -3,5-dimethyll-phenol 2-phenylacetylamino-4-chloro-5 -methylphenol 2-benzoylamino-4-chloro-5 -methylphenol 2-anilinoacetylamino-4-chloro-S-methylphenol 2-{4- a- 4"-tert.-a.mylphenoxy) -n-butyrylamino] ben zoylamio}-4-chloro-5 -methylphenol 2[4,3" (4"-tert.-amylphenoxy) benzoylamino] benzoyllamino-4-chloro-S-m ethylphenol 2-p-nitrobenzoylamino-4-chloro-S-methylphenol 2-m-aminobenzoyl-4-chloro-5 -methyl phenol 2-acetamino-4-chloro-5-methylphenol 2'( 4-sec.-amylbenza mino -4-chloro-5 -methyl phenol 4,-4'-di-( acetoacetamino -3 ,3 -dimethyldipheny1 p, p-di- (Acetoacetamino diphenylmethane Ethyl-p-'benzoylacetaminobenzenesulfonate Nonyl-p-benzoylacetaminobenzenesulfonate N-phenyl-N- (p-acetoacetaminophenyl) urea n-Propyl-p-benzoylacetaminobenzenesulfonate acetoacetpiperidine w-Benz oylacetpiperidide N(w-benzoy1acetyl)-1,2,3 ,4-tetrahydroquinoline N-( w-benzoylacetyl morpholine Our recording elements are not limited to cyan, yellowand magenta-forming couplers, since the only requirement is that the dyes formed in the two light-sensitive layers be easily distinguished from one another and preferably be complementary colors so that together they will form a neutral density image. Cyan-, yellowand magentaforming couplers such as those listed herein are all well known in the art of color photography.

The coupler compounds are dissolved in appropriate solvents and dispersed in a hydrophilic colloid as described by Jelley et al. in U.S. Patent 2,322,027, issued June 15, 1943.

Any of the bleachable filter dyes having appropriate transmission characteristics are used to advantage in the intermediate hydrop-hilic colloid layer when it is desired to incorporate a filter in the element. These dyes are bleached by the solutions used in developing and fixing. Included among the bleachable dyes used are the unsymmetrical oxonol dyes of Keyes et al. U.S. Patent 2,611,- 696, issued September 23, 1952; the styryl dyes of Sprague U.S. Patent 2,622,082, issued December 16, 1952; the pyrrole dyes of Reed U.S. Patent 2,725,378, issued November 29, 1955; the merocyanine dyes of Silberstein et al. U.S. Patent 2,527,583, issued October '31, 1950; and many other bleachable dyes Well known in the art.

Any of the hydrophilic materials such as gelatin and gelatin substitutes used in making the silver halide emulsions can be used to advantage for the interlayer and the overcoat layers of our recording elements.

Nondiifusing reducing agents used to advantage in our interlayer must not be detrimental to the light-sensitive layers and their oxidized form should preferably not be reactive with the color-forming couplers. Included among these compounds are the higher alkyl substituted hydroquinone compounds of Crevling et a1. U.S. Patent 2,899,- 334, issued August 11, 1959, such as 2,5-di-n-octylhydroquinone, 2-n-lauryl-5-n-amylhydroquinone, 2,5-di-n-octadecylhydroquinone, etc.

A wide variety of supports can be used for making our elements, including typical photographic supports, such as conventional paper or paper supports coated with a water resistant layer such as polyethylene, polymeric hydrosols (cg. U.S. Patent 3,021,214) etc., cellulose nitrate film, cellulose acetate film, polyvinyl acetal film, polystyrene film, polyethyleneterephthalate film, etc.

Our photographic recording element is used to advantage in the various recording instruments, playback equipment, multi-channel oscillographs or any other apparatus capable of producing a light signal from an electrical input signal. A conventional tungsten light source is used unfiltered for one-recording beam, another beam is filtered with a filter that will pass light to which only the first of the two light-sensitive layers is sensitive, and a third beam is filtered with another filter which will pass light to which only the second of the two sensitive layers is sensitive.

Our exposed element is developed in a developer in which a phenylenediamine type developing agent is used, then fixed in aconventional sodium thiosulfate fixing bath, and bleached with either a conventional type bleach with sodium ferricyanide as the bleaching agent or with ferric chloride as the bleaching agent.

The following typical examples will illustrate but not limit our invention.

- EXAMPLE '1 V A gel sized strip of photographic paper support was coated with a layer comprising an ordinary gelatino silver chlorobromide Washed emulsion sensitized to blue light into which was intimately blended two separate dispersions in gelatin, one containing a dispersion. (made as described in J elley et al. U.S. Patent 2,322,027, issued June 15, 1943) of a solvent solution of a magenta-forming coupler and the other containing a solvent solution of a yellow-forming coupler, such that approximately equal amounts of the couplers were present. This layer was coated with a gelatin interlayer containing a dispersion of dioctyl hydroquinone. The interlayer was coated with a layer comprising an ordinary gelatino silver chlorobromide emulsion sensitized to green light and intimately blended with a dispersion (made as described by Jelley et al.) of a solvent solution of the cyan-forming coupler in gelatin. This layer was coated with a :gelatin overcoat.

EXAMPLE 2 The photographic recording element of Example 1 was exposed in a multichannel oscillograph in which three separate records were made with light beams reflected from three galvanometer actuated mirrors. One light beam was tungsten light passed through a blue Wratten No. 34 filter, another light beam was tungsten light passed through a green Wratten No. 12 filter, and a third beam was unfiltered tungsten light.

After exposure, the strip of our recording element was given the following process:

(1) 3-minute development at F. in a solution having the composition:

(2) l-minute fixing bath at 100 F. having one part of the following composition diluted with 14 parts of water:

Sodium thiosulfate g 360.0 Ammonium chloride g 50.0 Sodium sulfite, desiccated g 15.0 Acetic acid, 28% cc 48.0 Boric acid, crystals g 7.5 Potassium alum g 15.0 Water to make l 1.0

(3) 1 /2 minutes bleach at 100 F. having the composition:

Potassium ferricyanide g 60.0 Disodium phosphate g 13.0 Monosodium phosphate g 5.0 Sodium bromide g 15.0 Water l 1.0 (4) 3 minutes water Wash at 100 F., and (5) Dry.

A good three channel record was obtained by processing our exposed element. The record made with the blue light beam was red, the record made with the green light beam was cyan, and the record made with the unfiltered light beam was a neutral density. Each record was clearly distinguishable from the other two.

Similarly, the developing agent 4-amino-N-ethyl-N(,8- methanesulfonamidoethyl) m toluidine sesquisulfate i on r 9' monohydrate used in the developer solution of Example 1 can be replaced with other conventional p-phenylenediamine developing agent, such as 4-amino-N-ethyl-N-[i-hydroxyethyl-F:-methylaniline sulfuric acid salt,

' N-ethyl-B-methanesulfonamidoethyl-3-methyl-4-aminoaniline sulfate, N-ethyl-fi-methanesulfonamidoethyl-4-aminoaniline, Z-amino-5-diethylaminotoluene hydrochloric acid salt, 4-N-ethyl-N-[3-hydroxyethylaminoaniline, etc.

All of these developing agents are characterized by having one primary amine group.

EXAMPLE 3 An element of Example 1 was exposed in Example 2 and processed in the Kodak Color Print Process P-122 used by Photofinishing Laboratories to give good records like those obtained in Example 2.

EXAMPLE 4 (a) Overcoat:

Blue-Sensitive Layer-Cyan Coupler Interlayer Green-Sensitive Layer-Yellow and Magenta Couplers Paper Support Overcoat:

Green-Sensitive Layer-Magenta Coupler Interlayer Blue-Sensitive Layer-Cyan and Yellow Couplers Paper Support (c) Overcoat:

Similarly, each of these elements can be altered by interchanging the physical position of the light-sensitive layers, for example, (d) can be changed as follows:

(f) Overcoat: v

Green-Sensitive Layer-Cyan and Magenta Couplers Interlayer Blue-Sensitive Layer-Yellow Coupler Paper Support Our invention is still further illustrated by the accompanying drawing, FIGS. '1 and 2 showing cross sections of a typical element being used according to our invention.

FIG. 1 shows one of our photographic recording elements comprising paper support 17 coated with a bluesensitive silver halide emulsion layer 16 with incorporated yellow-forming coupler and magenta-forming coupler in approximately equal amounts, coated with gelatin interlayer 15, coated with green-sensitive silver halide emulsion layer 14 with incorporated cyan-forming coupler, coated with gelatin overcoat layer 13 being exposed with a beam of unfiltered tungsten light, a beam of green filtered tungsten light, and a beam of blue filtered tungsten light in an oscillograph.

FIG. 2 shows the images formed in the element exposed in FIG. 1 by development. The cyan dye image 18 in layer 14 and the combined yellow and magenta dye image 19 in layer 16 formed by development of the white light exposed element produced a neutral density image While the cyan dye image in layer 14 was formed by development of the element exposed to green filtered light, and the red (that is, yellow and magenta) dye image 19 in layer 16 Was formed by development of the element exposed to blue filtered light.

Our photographic recording elements are valuable for use in recording instruments, playback equipment, multichannel oscillographs or any other apparatus capable of producing a light signal from an electrical imput signal. Our elements provide increased information storage per unit area over the conventional black-and-white elements. In the preferred elements of our invention, the two dye images formed are complementary in color and therefore they contrastwith one another as much as possible as well as With the neutral density image that is produced by developing areas of the element that were exposed to White light. Our element does not require the special high intensity ultraviolet light sources many of the prior art recording papers need for exposure.

The invention has been described in detail with particular reference to preferred embodiments thereof but it will be understood that variations and modifications can be effected within the spirit and scope of the invention as described hereinabove and as defined in the appended claims.

We claim:

1. A photographic element with two light-sensitive layers, said element comprising .a photographic support having coated thereon:

(1) one blue light-sensitive colored-image-forming layer comprising;

' (a) a hydrophilic colloid,

(b) a blue-sensitive silver halide emulsion that is not sensitive to the red and green portions of the visible spectrum, and

(c) a color-forming coupler composition selected from the class consisting of those producing a cyan dye image, and those producing a red dye image; and

(2) one green light-sensitive colored-image-forming layer comprising;

(a) a hydrophilic colloid,

(b) a green-sensitive silver halide emulsion, and

(c) a color-forming coupler composition selected from the class consisting of those producing a cyan dye image and those producing a red dye image, such that the colored image formed in the first mentioned layer is complementary to the colored image formed in the second mentioned layer so that when combined they form a black image.

2. A photographic element of claim 1 in which the support is transparent and the blue-sensitive layer is coated on one side and the green-sensitive layer is coated on the other side.

3. A photographic element of claim 1 in which the support is coated in succession with the green-sensitive layer and the blue-sensitive layer.

4. A photographic element of claim 1 in which the support is coated in succession with the green-sensitive layer, a layer comprising a dispersion of a higher alkyl substituted hydroquinone in a hydrophilic colloid, and the blue-sensitive layer.

5. A photographic element of claim 1 in which the support is coated in succession with the green-sensitive layer, a layer comprising a bleachable blue light absorbing dye and a. hydrophilic colloid.

6. A photographic element of claim 1 in which the blue-sensitive layer contains a cyan-forming coupler, and the green-sensitive layer contains a yellow-forming coupler and a magentadorming coupler.

7. A photographic element of claim 1 in which the blue-sensitive layer contains a yellow-forming coupler and a magenta-forming coupler, and the green-sensitive layer contains a cyan-forming coupler.

8. A process for recording the time variations of elec trical phenomena with a recording instrument on a photographic element, said element comprising a photographic support having coated thereon:

(1) one blue light-sensitive colored-image-forming layer comprising;

(a) a hydrophilic colloid,

(b) a blue-sensitive silver halide emulsion. that is not sensitive to the red and green portions of the visible spectrum, and

(c) a color-forming coupler composition selected from the class consisting of those producing a cyan dye image, and those producing a red dye image; and

(2) one green light-sensitive colored-image-forming layer comprising;

(a) a hydrophilic colloid,

(b) a green-sensitive silver halide emulsion, and

(c) a color-forming coupler composition selected from the class consisting of those producing a cyan dye image and those producing a red dye image, such that the colored image formed in the first mentioned layer is complementary to the colored image iormed in the second mentioned layer so that when combined they form a black image; said process comprising the steps of:

(l) converting said electrical phenomena to light beams whose changes are proportional to the current produced by the respective electrical phenomena, one of said light beams consisting of essentially white light, a second light beam consisting of blue light, and a third light beam consisting of green light;

(2) recording the said changes in each of the said light beams as latent images on said photographic element that is moved in a direction perpendicular to the plane of said light beams so that a latent image is produced of the blue light beam in said blue light-sensitive layer, a latent image is produced of the green light beam in said green light-sensitive layer and a latent image is produced of the white light beam in both the blue lightasensitive layer and the green light-sensitive layer; and

(3) converting the said latent images to colored images by developing the exposed photographic element in a p-phenylenediamine type developer, and removing the unexposed silver halide from the element by treating said element in a fixing bath, so that the processed element has a black image record of the white light beam, a colored image record selected from the class consisting of a cyan image and a red image of the blue light beam in the said blue-sensitive layer and a colored image record selectedfrom the class consisting of a red image and a cyan image of the green light beam in the said green-sensitive layer so that when the image produced in the bluesen'sitive layer is cyan colored, the image produced in the green-sensitive layer is red colored and vice versa.

References Cited by the Examiner UNITED STATES PATENTS 2,705,200 3/1955 T ulagin 9674 2,760,404 8/ 1956 King 96--43 2,997,388 8/1961 Blanchard 9674 3,035,913 5/1962 Hel-lmig 9674 FOREIGN PATENTS 562,854 7/ 1944 Great Britain.

OTHER REFERENCES Leiss et al., Instruments, vol. 20, pages 709-11 (1947).

NORMAN G. TORCHIN, Primary Examiner.

J. T. BROWN, Assistant Examiner. 

1. A PHOTOGRAPHIC ELEMENT WITH TWO LIGHT-SENSITIVE LAYERS, SAID ELEMENT COMPRISING A PHOTOGRAPHIC SUPPORT HAVING COATED THEREON: (1) ONE BLUE LIGHT-SENSITIVE COLORED-IMAGE-FORMING LAYER COMPRISING; (A) A HYDROPHILIC COLLOID, (B) A BLUE-SENSITIVE SILVER HALIDE EMULSION THAT IS NOT SENSITIVE TO THE RED AND GREEN PORTIONS OF THE VISIBLE SPECTRUM, AND (C) A COLOR-FORMING COUPLER COMPOSITION SELECTED FROM THE CLASS CONSISTING OF THOSE PRODUCING A CYAN DYE IMAGE, AND THOSE PRODUCING A RED DYE IMAGE; AND (2) ONE GREEN LIGHT-SENSITIVE COLORED-IMAGE-FORMING LAYER COMPRISING; 